package org.apache.maven.repository.internal;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.io.File;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.TimeZone;

import org.apache.maven.artifact.repository.metadata.Metadata;
import org.apache.maven.artifact.repository.metadata.Snapshot;
import org.apache.maven.artifact.repository.metadata.SnapshotVersion;
import org.apache.maven.artifact.repository.metadata.Versioning;
import org.eclipse.aether.artifact.Artifact;

/**
 * @author Benjamin Bentmann
 */
final class RemoteSnapshotMetadata extends MavenSnapshotMetadata {

  private final Map<String, SnapshotVersion> versions = new LinkedHashMap<String, SnapshotVersion>();

  public RemoteSnapshotMetadata(Artifact artifact, boolean legacyFormat) {
    super(createRepositoryMetadata(artifact, legacyFormat), null, legacyFormat);
  }

  private RemoteSnapshotMetadata(Metadata metadata, File file, boolean legacyFormat) {
    super(metadata, file, legacyFormat);
  }

  public MavenMetadata setFile(File file) {
    return new RemoteSnapshotMetadata(metadata, file, legacyFormat);
  }

  public String getExpandedVersion(Artifact artifact) {
    String key = getKey(artifact.getClassifier(), artifact.getExtension());
    return versions.get(key).getVersion();
  }

  @Override
  protected void merge(Metadata recessive) {
    Snapshot snapshot;
    String lastUpdated = "";

    if (metadata.getVersioning() == null) {
      DateFormat utcDateFormatter = new SimpleDateFormat("yyyyMMdd.HHmmss");
      utcDateFormatter.setTimeZone(TimeZone.getTimeZone("UTC"));

      snapshot = new Snapshot();
      snapshot.setBuildNumber(getBuildNumber(recessive) + 1);
      snapshot.setTimestamp(utcDateFormatter.format(new Date()));

      Versioning versioning = new Versioning();
      versioning.setSnapshot(snapshot);
      versioning.setLastUpdated(snapshot.getTimestamp().replace(".", ""));
      lastUpdated = versioning.getLastUpdated();

      metadata.setVersioning(versioning);
    } else {
      snapshot = metadata.getVersioning().getSnapshot();
      lastUpdated = metadata.getVersioning().getLastUpdated();
    }

    for (Artifact artifact : artifacts) {
      String version = artifact.getVersion();

      if (version.endsWith(SNAPSHOT)) {
        String qualifier = snapshot.getTimestamp() + '-' + snapshot.getBuildNumber();
        version = version.substring(0, version.length() - SNAPSHOT.length()) + qualifier;
      }

      SnapshotVersion sv = new SnapshotVersion();
      sv.setClassifier(artifact.getClassifier());
      sv.setExtension(artifact.getExtension());
      sv.setVersion(version);
      sv.setUpdated(lastUpdated);

      versions.put(getKey(sv.getClassifier(), sv.getExtension()), sv);
    }

    artifacts.clear();

    Versioning versioning = recessive.getVersioning();
    if (versioning != null) {
      for (SnapshotVersion sv : versioning.getSnapshotVersions()) {
        String key = getKey(sv.getClassifier(), sv.getExtension());
        if (!versions.containsKey(key)) {
          versions.put(key, sv);
        }
      }
    }

    if (!legacyFormat) {
      metadata.getVersioning().setSnapshotVersions(new ArrayList<SnapshotVersion>(versions.values()));
    }
  }

  private static int getBuildNumber(Metadata metadata) {
    int number = 0;

    Versioning versioning = metadata.getVersioning();
    if (versioning != null) {
      Snapshot snapshot = versioning.getSnapshot();
      if (snapshot != null && snapshot.getBuildNumber() > 0) {
        number = snapshot.getBuildNumber();
      }
    }

    return number;
  }

}
